Cyclohexenyl acetic acid compounds

ABSTRACT

Cyclohexenyl acetic acid compounds of the formula WHEREIN R1, R2 and R3 are hydrogen or lower alkyl ; N IS 1 TO 4; AND X is hydroxyl, amino, alkylamino or hydroxylamino. These compounds possess analgesic and antiinflammatory properties.

United States Patent Vincent et al. 1 Oct. 10, 1972 [54] CYCLOHEXENYL ACETIC ACID [56] References Cited MP D [72] 3 l v 'B Geo UNITED STATES PATENTS nventors: 'c e incent, agneux; rges Remond Paris; Jean-Claude Shaw et F Polgnan lssous all of rance Pnmary Exammerborrame A. Wemberger [73] Assignee: Societe en nom collectif Science A i t t E miner--Robert Gerstl Union at Cie. Societe Francaise de Att0rney-Cifelli, Behr and Rhodes Recherche Medicale-Suresnes 22 Filed: Nov. 3, 1969 [57] ABSTRACT [211 App. No: 873,659 Cyclohexenyl acetic acid compounds of the formula 012mn [30] Foreign Application Priority Data L +-fi- Nov. 13, 1968 Great Britain ..53,864/68 R2 (D wherein [52] US. Cl ..260/5l4 R, 260/247.2 R, 260/268 R, R d R h d 1 1k 1 260/24388, 260/468 R, 260/500.S H, 5}; ,21 if y or a y 260/501.1, 260/557 R, 260/586 R, 424/315, X is hydroxyl, amino, alkylamino or hydroxylamino. 424/316 424/317 424/320 These compounds possess analgesic and antiinflamma- [5 1] Int. Cl. ..C07c 61/28, C07c 103/19, C07c 83/08 tory properties [58] Field of Search ..260/468, 514

3 Claims, No Drawings CYCLOHEXENYL ACETIC ACID COMPOUNDS The present invention provides new cyclohexenyl acetic acid compounds of the general formula (I):

Q-i-rwherein R,, R and R each represents a hydrogen atom or a lower alkyl radical containing one to five carbon atoms inclusive;

n is an integer from 1 to 4 inclusive; and

X represents a hydroxyl, amino, lower alkylamino,

wherein the alkyl moiety has from one to five carbon atoms inclusive, or hydroxyl-amino radical.

The new derivatives of the general formula (I) were prepared by dehydrating a compound of the general formula (II):

in which R,, R and R have the meanings defined above and R, represents a lower alkyl radical containing one to five carbon atoms inclusive;

and by reacting the so-obtained compound of the general formula (Ill):

R3 R1 H )n 2 LQd-owm m in which R R R and R have the meanings defined above, with a compound of the general formula (IV):

and from a-bromoester of the general formula in which R,, R R and R have the meanings defined above.

The new derivatives of the general formula (I), in which X is a hydroxyl or hydroxylamino radical, can be transformed into addition salts with mineral or organic bases, such for example, as bases of alkaline or alkaline earth metals, primary, secondary and tertiary amines, such as mono-, diand triethylamines, and heterocyclic bases such, for example, as morpholine, piperazine, piperidine, etc... The present invention also provides these salts.

All the derivatives of the present invention contain at least one asymmetric carbon atom and thus may be resolved in optical isomers by methods known per se. The optical isomers of the derivatives of the general formula (I) are also included in the present invention.

The following Examples illustrate the invention:

EXAMPLE I (4-cyclohexyl- 1 -cyclohexenl -yl) acetic acid A solution of 6. l g (0.024 mol.) of ethyl (4-cyclohexyl-l-cyclohexen-l-yl) acetate, B.P. 0.05 mm Hg: 124-l25 C, preparedaccording to the methods of Reformatsky and G.A.R. Kon and KS. Nargund, J. Chem. Soc. 2461 (1932), in 268 ml of N-sodium hydroxide solution and 386 ml of ethanol, is heated at reflux for 4 hours.

After concentration to dryness, the residue is dissolved into distilled water and the unsaponifiable products are extracted with ether. The aqueous layer is acidified until pH with 5 N HCl, and the precipitated acid is taken out with ether. The ethered solution is washed with distilled water, dried on calcium sulphate, filtrated and concentrated to dryness. The crystalline residue is recrystallized from 250 ml of pentane. 3.3 g of (4-cyclohexyl-l-cyclohexen-l-yl) acetic acid, M.P. (capillary) l00l0l C, are obtained, yield: 61.2 percent.

EXAMPLES 2 to 9 The following derivatives are prepared according to the method described in Example 1:

2 a-( 4-cyclohexyl-lcyclohexen l-yl) propionic acid,

M.P. capillary: 5557 C, starting from ethyl a-(4- cyclohexyl-l-cyclohexen-l-yl) propionate, B.P. 0.01 mm Hg: 1 l4l 18 C, yield: 72.3 percent, itself prepared from ethyl a-( l-hydroxy-4-cyclo-hexyl cyclohexyl) propionate, B.P. 0.03 mm Hg: l24-l26 C, yield: 75.8 percent, itself prepared from 4-cyclohexyl cyclohexanone and ethyl a-bromopropionate, yield:

66.8 percent.

3. a-(4-cyclohexyll -cyclohexenl -yl) butyric acid, M.P. (capillary): 8385 C, starting from ethyl a-(4- cyclohexyl-l-cyclohexen-l-yl) butyrate, B.P. 0.03 mm Hg: l20-l24 C, yield: 55.9 percent, itself prepared from ethyl a-( l-hydroxy-4-cyclohexyl cyclohexyl) butyrate, B.P. 0.01 mm Hg: 148152 C, yield: 71.4 percent, itself prepared from 4-cyclohexyl cyclohexanone and ethyl a-bromobutyrate, yield: 59.4 percent.

4. a-( 4-cyclohexyll -cyclohexenl -yl) isobutyric acid,

M.P. (Kofler) l4l-l42 C, starting from ethyl a-(4- cyclohexyl-l-cyclohexen-l-yl) isobutyrate, B.P. 0.05 mm Hg: 1 20-l 22 C, yield: 47 percent, itself prepared from ethyl a-(l-hydroxy-4-cyclohexyl-cyclohexyl) isobutyrate, B.P. 0.05 mm Hg: 128l32 C, yield: 6 l .9

percent, itself prepared from 4-cyclohexyl cyclohexanone and ethyl'a-bromo isobutyrate, yield: 62.2 percent.

The sodium a-( 4-cyclohexyl- 1 -cyclohexenl -yl) isobutyrate, M.P. (Kofler): l41142 C, was prepared from a-,(4-cyclohexyl-l-cyclohexen-l-yl) isobutyric acid previously obtained, yield: 74 percent.

5. a-[ 4-( l-methyl-cyclohexyl)- l -cyclohexenl -yl] propionic acid.

M.P. (capillary): 70-74 C, starting from ethyl a-[4- l -mcthyl-cyclohcxyl l -cyclohexen-l-yl] propionate, B.P. 0.07 mm Hg: l29-l 30 C, yield: 35 percent, itself prepared from ethyl a-[ l hydroxy-4-( l-methylcyclohexyl)-cyclohexyl] propionate, B.P. 0.02 mm Hg:

134l36 C, yields 60.7 percent, itself prepared from 4-( l-methyl-cyclo-hexyl) cyclohexanone and ethyl abromopropionate, yield: 66.5 percent.

6. a-[4( l-methyl-cyclopentyl)- l-cyclohexen- 1 -yl] propionic acid,

M.P. (capillary): 6870 C, starting from ethyl a-[4- l-methyl-cyclopentyl)- l -cyclohexenl -yl] propionate, Bi. 0.07 mm Hg: l20-l22 C, yield: 72.8 percent, itself prepared from ethyl a-[ l-hydroxy-4-(1- methyl-cyclopentyl) cyclohexyl] propionate, B.P. 0.05 mmHg: l20124 C, yield: 74 percent, itself prepared from 4-( l-methyl-cyclopentyl) cyclohexanone and ethyl a-bromopropionate, yield: 74.6 percent.

7. a[4-( l-butyl-cyclopentyl)- l-cyclohexenl -yl] propionic acid,

starting from ethyl a-[4-( l-butyl-cyclopentyl)-lcyclohexen-l-yl] propionate, itself prepared from ethyl a-[ l -hydroxy-4-( l-butyl-cyclopentyl) cyclohexyl] propionate, itself prepared from 4-( l-butyl-cyclopentyl) cyclohexanone and ethyl a-bromopropionate.

8. a-[4-( l-ethyl-cycloheptyl)- l-cyclohexenl-yl} propionic acid,

starting from ethyl a-[4-( l-ethyl-cycloheptyl)-lcyclohexenl-yl] propionate, itself prepared from ethyl a-[ l-hydroxy-4-( l-ethylcycloheptyl) cyclohexyl] propionate, itself prepared from 4-( l-ethyl-cycloheptyl) cyclohexanone and ethyl a-bromopropionate.

9. a-(4-cyclooctyll-cyclohexenl -yl) butyric acid,

starting from ethyl a-(4-cyclooctyl-l-cyclohexen-lyl) butyrate, itself prepared from ethyl a-( l-hydroxy4- cyclooctyl cyclohexyl) butyrate, itself prepared from 4- cyclooctyl cyclohexanone and ethyl a-bromobutyrate.

EXAMPLE l (4-cyclohexyll -cyclohexenl -yl) acetohydroxamic A hydroxylamine solution was prepared starting from 9.25 g i (0.13 mol.) of hydroxylamine hydrochloride and 3.17 g (0.13 atom-gramme) of sodium in 60 ml of ethanol. The sodium chloride formed was filtrated and 22 g (0.088 mol.) of ethyl (4- cyclohexyl-l-cyclohexen-l-yl) acetate and a solution of sodium ethylate (prepared starting from 2 g (0.088 atom-gramme) of sodium in 51 ml of ethanol) were added to the filtrate while stirring and maintaining the temperature within the range of from 0 to +5 C. The mixture was then allowed to stand for 48 hours at room temperature; and concentrated to dryness.

The residue was dissolved in 1,500 ml of water and the solution acidified by hydrochloric acid until pH (4-cyclohexyl- 1 -cyclohexenl -yl) acetohydroxamic acid was suctioned off, washed with distilled water,

dried and crystallized in a water-ethanol solution. M.P.

(capillary): l65-l68 C, with decomposition, yield: 52.4 percent.

EXAMPLES l l to 12 EXAMPLE 13 a-( 4-cyclohexyll -cyclohexenl-yl) propionamide M.P. (Kofler): -l4l C (cyclohexane), starting from ethyl a-(4-cyclohexyll -cycl0hexenl -yl) propionate and an ammoniacal solution, yield: 50 percent.

EXAMPLE 14 N-ethyl a-(4-cyclohexyll -cyclohexenl -yl) propionamide O-Q-CH-C-NH-CHrCHa ..l

M.P. (capillary): l0l102 C (pentane/cyclohexane), starting from ethyl a-(4-cyclohexyl-l-cyclohexen-l-yl) propionate and monoethylamine, yield: 31.6 percent.

The cyclohexenyl acetic acid derivatives and their physiologically tolerable salts of the present invention are valuable pharmaceutical products having especially analgesic and antiinflammatory properties.

The toxicity studied in mice showed that their LD varies from to 300 mg/kgby the intraperitoneal route and from 750 to 2,000 mg/kg by the oral route.

The antiinflammatory activity was'demonstrated according to the method of CH. Winter et al. (Proc. Soc. Exp. Biol. Med. 3, 544 1962). It was observed that the new compounds administered at doses of 40 to 80 mg/kg P.O., decrease from 19 to 58 percent the plantar oedema of the rats paw induced by carrageenine.

The analgesic activity was studied in rats by the method of L0. Randall and J .J Sellito (Arch. Intemat. Pharmacodyn. III, 409 (1957). 'It was noted that the new derivatives administered at doses of 40 to 80 mg/kg P.O., increase the threshold of pain-perception from 16 to 137 percent.

The invention further includes pharmaceutical wherein: I preparations containing a derivative of the general formula (l) or a physiologically tolerable salt thereof in R2 and a Seleced from hydrogen and lower admixture or conjunction with a pharmaceutically alky] contammg from one to five carbon atoms suitable carrier such, for example, as distilled water, 5 Cluswe:

glucose, lactose, talc, starch, cocoa butter, etc. The pharmaceutical forms may be: tablets, dragees, capsules, suppositories or solutions for oral, rectal or n is an integer from 1 to 4 inclusive; and (B) physiologically acceptable addition salts of the parenteral administration at doses from 50 to 500 mg, CQmPOmdS of F germ-F11 formula i one to five times per day 1O mineral or organic bases suitable for forming said We claim: Salts l. A compound selected from the group consisting of (A) cyclohexenyl acetic acid compounds of the general formula (I):

2. A compound of claim 1 which is a-(4cyclohexyl-l -cyclohexenl -yl) propionic acid.

3. A compound of claim 1 which is a-[4-( l-methyl- R1 I H2511 i (H3 o1-1 cyclopentyl)-l-cyclohexen-l-yl] propionic acid.

in s ertv-(B)-- f UNITEIS STATE-S PATENT OFFICE CERTIFICATE OF CORRECTION 12:11am; N0. 3, 697,585 Dated U0 Lobe-1" 10, W72.

Michel "Vincent, Georges Remond, Jean-Claude Poignent It is certified thafi eri'bt apfieets iri-the aboveidentified patent and that said Letters Patent; are hereby corrected as shown below:

Column 2, line 31, lete "pH insert -'-pH l-.

Column line 2, fde'lete "pH in se r-t --pH l-'.

line 64, elelete'Tt'alie lll, insert -lll-- as in one hundred and-eleven.

Column 6, line 6 delete (B) line 7, before the word "physiologicallyf', V

Signed and sealed this 7th day of Jahuary P375.

(SEAL) Attest:

' MCCOY M. GIBSON JR-.: j c, MARSHALL DANN Attesting. Office: Commissioner of Patents 

2. A compound of claim 1 which is Alpha -(4-cyclohexyl-1-cyclohexen-1-yl) propionic acid.
 3. A compound of claim 1 which is Alpha -(4-(1-methyl-cyclopentyl)-1-cyclohexen-1-yl) propionic acid. 